Copy the SwTextNode::GetDropLen, as it can't be used in case the drop-text would include a delete redline, but the SwTextNode one is apparently needed by the WW8 filter.
f041a3d02b72 sw_redlinehide: add a SwTextFrame::GetDropLen()
sw/source/core/inc/txtfrm.hxx | 2 ++
sw/source/core/text/txtdrop.cxx | 57 ++++++++++++++++++++++++++++++++++++++++-
2 files changed, 58 insertions(+), 1 deletion(-)